Halo velocity profiles in screened modified gravity theories

被引:30
|
作者
Gronke, M. [1 ]
Llinares, C. [1 ]
Mota, D. F. [1 ]
Winther, H. A. [2 ]
机构
[1] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway
[2] Univ Oxford, Astrophys, DWB, Oxford OX1 3RH, England
关键词
gravitation; galaxies: clusters: general; galaxies: kinematics and dynamics; dark energy; large-scale structure of Universe; GENERAL-RELATIVITY; F(R); SIMULATIONS; MATTER; ENVIRONMENT; PHYSICS; SPACE; VOIDS; CODE;
D O I
10.1093/mnras/stv496
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Screened modified gravity predicts potentially large signatures in the peculiar velocity field that makes it an interesting probe to test gravity on cosmological scales. We investigate the signatures induced by the Symmetron and a Chameleon f(R) model in the peculiar velocity field using N-body simulations. By studying fifth force and halo velocity profiles, we identify three general categories of effects found in screened modified gravity models: a fully screened regime where we recover Lambda cold dark matter to high precision, an unscreened regime where the fifth force is in full operation, and, a partially screened regime where screening occurs in the inner part of a halo, but the fifth force is active at larger radii. These three regimes can be pointed out very clearly by analysing the deviation in the maximum cluster velocity. Observationally, the partially screened regime is of particular interest since an uniform increase of the gravitational force - as present in the unscreened regime - is degenerate with the (dynamical) halo mass estimate, and, thus, hard to detect.
引用
收藏
页码:2837 / 2844
页数:8
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